Hardy-Weinberg Equilibrium Calculator

About

The Hardy-Weinberg Equilibrium Calculator is a genetics learning tool for calculating allele and genotype frequencies in two-allele populations. It provides two calculation modes. The first starts with the dominant allele frequency (p), automatically determines the recessive allele frequency (q), and calculates expected AA, Aa, and aa genotype frequencies. An optional population size can be used to calculate expected genotype counts. The second mode starts with observed counts for homozygous dominant, heterozygous, and homozygous recessive genotypes. From these counts, the calculator determines allele frequencies, expected Hardy-Weinberg genotype counts, and a chi-square test result for equilibrium. The page also explains the Hardy-Weinberg equations, the five conditions required for equilibrium, common calculation mistakes, chi-square interpretation, worked examples, and applications in genetics. It is designed around the standard two-allele Hardy-Weinberg model used in introductory genetics coursework.

Problem & solution

Who it's for

Genetics students working on assignments, labs, and exam problems.

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  commercial6566Sep 9, 2026

  Welcome! Built this free tool to help genetics students master Hardy-Weinberg equilibrium. Supports both allele-frequency mode and observed count mode with automatic Chi-Square goodness-of-fit testing. Let me know if the worked steps are clear!

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